sulpherous air which on the Appli
cation of a candle or Coal of Fire bla
zes to the heighth of about two feet
& about 20 miles in
Diameter- On the Bank of the
same River about 150 feet in height
from the shore is an Antient forti
fication covering about three quar
ters of an Acre- behind which is
an Entrenchment about 10 feet
in Depth having neat the middle
a level Gateway of perhaps 10
feet & with [intis?] also level- this
is supposed to have been entrench
ed by Civilized Inhabitants per
haps 2000 year ago, as none
of the Indians can give any
account of it- There are two
similar fortifications on the Alle
gany River